Articles written in Pramana – Journal of Physics
Volume 64 Issue 2 February 2005 pp 221-227 Research Articles
Angular momentum transfer in incomplete fusion
B S Tomar K Surendra Babu K Sudarshan R Tripathi A Goswami
Isomeric cross-section ratios of evaporation residues formed in
Volume 68 Issue 1 January 2007 pp 111-116 Brief Reports
Odd–even effect in fragment angular momentum in low-energy fission of actinides
B S Tomar R Tripathi A Goswami
Quantitative explanation for the odd–even effect on fragment angular momenta in the low-energy fission of actinides have been provided by taking into account the single particle spin of the odd proton at the fragment's scission point deformation in the case of odd-𝑍 fragments along with the contribution from the population of angular momentum bearing collective vibrations of the fissioning nucleus at scission point. The calculated fragment angular momenta have been found to be in very good agreement with the experimental data for fragments in the mass number region of 130–140. The odd–even effect observed in the fragment angular momenta in the low-energy fission of actinides has been explained quantitatively for the first time.
Volume 72 Issue 6 June 2009 Article ID 1 Research Articles
Dielectric properties of CdS nanoparticles synthesized by soft chemical route
CdS nanoparticles have been synthesized by a chemical reaction route using thiophenol as a capping agent. The frequency-dependent dielectric dispersion of cadmium sulphide (CdS) is investigated in the temperature range of 303–413 K and in a frequency range of 50 Hz–1 MHz by impedance spectroscopy. An analysis of the complex permittivity ($\varepsilon'$ and $\varepsilon''$ ) and loss tangent ($\tan \delta) with frequency is performed by assuming a distribution of relaxation times. The scaling behaviour of dielectric loss spectra suggests that the relaxation describes the same mechanism at various temperatures. The frequency-dependent electrical data are analysed in the framework of conductivity and modulus formalisms. The frequency-dependent conductivity spectra obey the power law.
Volume 85 Issue 2 August 2015 pp 315-322
Non-compound nucleus fission in actinide and pre-actinide regions
R Tripathi S Sodaye K Sudarshan
In this article, some of our recent results on fission fragment/product angular distributions are discussed in the context of non-compound nucleus fission. Measurement of fission fragment angular distribution in 28Si+176Yb reaction did not show a large contribution from the non-compound nucleus fission. Data on the evaporation residue cross-sections, in addition to those on mass and angular distributions, are necessary for better understanding of the contribution from non-compound nucleus fission in the pre-actinide region. Measurement of mass-resolved angular distribution of fission products in 20Ne+232Th reaction showed an increase in angular anisotropy with decreasing asymmetry of mass division. This observation can be explained based on the contribution from pre-equilibrium fission. Results of these studies showed that the mass dependence of anisotropy may possibly be used to distinguish pre-equilibrium fission and quasifission.
Volume 97, 2023
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